rs397516055

chr11-47350008-A-Cchr11-47350008-A-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000256.3(MYBPC3):c.505+6T>G variant causes a splice donor region, intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: MYBPC3 NM_000256.3 splice_donor_region, intron
• Scores: Splicing: ADA: 0.1450
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.64

Genes affected

MYBPC3 (HGNC:7551): (myosin binding protein C3) MYBPC3 encodes the cardiac isoform of myosin-binding protein C. Myosin-binding protein C is a myosin-associated protein found in the cross-bridge-bearing zone (C region) of A bands in striated muscle. MYBPC3 is expressed exclusively in heart muscle and is a key regulator of cardiac contraction. Mutations in this gene are a frequent cause of familial hypertrophic cardiomyopathy. [provided by RefSeq, May 2022]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.48).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYBPC3	NM_000256.3	c.505+6T>G		splice_donor_region_variant, intron_variant		ENST00000545968.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYBPC3	ENST00000545968.6	c.505+6T>G		splice_donor_region_variant, intron_variant		5	NM_000256.3	P4
MYBPC3	ENST00000399249.6	c.505+6T>G		splice_donor_region_variant, intron_variant		5		A2
MYBPC3	ENST00000544791.1	c.505+6T>G		splice_donor_region_variant, intron_variant, NMD_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 37

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 16, 2011

The 505+6T>G variant has not been reported in the literature. It has been detec ted in 1 Asian HCM proband (out of 162 tested) by our laboratory. It should be noted that this lab has sequenced the MYBPC3 in only 162 Asian individuals and c an therefore not exclude the possibility that this varinat is common in the Asia n population.This variant is located in the 5' splice region but does not affect the highly conserved +1 and +2 positions. However, positions +3 to +6 are part of the splicing consensus sequence and variants involving these positions somet imes affect splicing. Pathogenic splice variants in the MYBPC3 gene are common in HCM, which increases the possibility that this variant is disease causing. Ho wever, it has not yet been seen in isolation in an affected individual and addit ional studies are needed to determine its clinical significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.48
Cadd	Benign	17
Dann	Benign	0.80

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.15
dbscSNV1_RF	Benign	0.43
SpliceAI score (max)		0.85		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.85		Position offset: 0

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs397516055; hg19: chr11-47371559;